Quote:
Originally posted by Thomas Reynolds
What super accurate reference gauge do you have?
Ever since the D.C. convention where you talked about the inaccuracies of most timing lights, I have been looking for a used snap-on with a tach readout. Is the snap-on really that much more accurate? (those things are expensive $$$$$) 
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It is a amtech lab grade gauge accurate to withing 1% of the gauge sweep.
I found snap on lights to all read the same while craftsman, sun etc. seem to be +- 2 degrees!
Mike